INDIANAPOLIS — Authorities investigating a deadly Indianapolis house explosion believed caused by an intentional natural gas blast remain tight-lipped about their probe, declining to say if they've identified potential suspects or made any breaks in the case.

Marion County Prosecutor Terry Curry said Wednesday no arrests have been made in the Nov. 10 blast that killed a young couple and destroyed or heavily damaged dozens of homes. He says investigators are continuing to seek and serve warrants and question people "as additional information develops."

He declined to say who investigators had questioned, if they had identified any potential suspects or made any breaks in the case.

Authorities said Monday they had concluded the blast was not an accident.

Curry says investigators are continuing to "narrow down the precise mechanics of the explosion."